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Full text of "Text Book Of Mechanical Engineering"

826

Appendix If.

and the results of his investigations are set out in Fig. 796 for
working and force fits. Drive fits are to have from | to | the
largeness given for force fits, the former for light drives, and the
latter for heavy ones. The high and low gauges should be so

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28

OR   RUNNING

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MQ. 796.

NB.    DRIVING   FITS    OM-HflL.F   FGRGE   f/TS,

made that the clearance (or largeness) should always be between
the maximum and minimum amounts shewn, and the method is
known as the 'limit' system. (For shrink fits see p. 842.)

I);
f s

CHAPTER VII.

P. 286.   Caulking, if moderate, is not objectionablef but
split caulking is as bad as it can be, and should be
guarded against    It consists of splitting off and then turning in it
the joint a strip of iron about 7\. in. wide, and although it
stop a leak at the time, ultimately breaks out

P.  313.    Increased  Pressure  in   Rivetter   when

closing.-The pressure of water in a rivetta:           1500 Ibt*

per square in. at first, is increased by about 50% at tbe

of closing the rivet, or to about 2250 Ibs* per             in.; the